JP2007002437A - Transportation system of dredged sediment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently discharge a large quantity of sediment deposited on the water bottom of a large reservoir such as a dam to the sea or the like with comparatively little energy and at a comparatively low cost while avoiding an influence on a natural environment. <P>SOLUTION: A transportation line L comprises a siphon pipe S for sucking out dredged sediment in the large reservoir D together with water by siphon action, and a natural flow-down line P for allowing a fluid including the dredged sediment and water sucked out by the siphon pipe S to naturally flow down to the sea or a nearby river utilizing gravity. The natural flow-down line P has a plurality of pipelines Pp, relay pits Pm interposed between the mutually adjacent pipelines Pp, and a water/sediment separating treatment means SE provided continuous to the downstream end of the pipeline on the lowermost reaches and capable of separating water from the fluid flowing down the pipeline, to discharge the water to the sea or the nearby river while temporarily storing the remaining dredged sediment to be collected. The transportation line L is provided with a power converting means G for converting the flow energy of the fluid flowing therein into electric energy. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a dredged sand transport system for transporting dredged sand from a large-capacity reservoir such as a dam where river water flows from a high place away from the sea from the reservoir to the sea or a nearby river. .

  In addition, in this specification, "sedimental sand" includes sediment, mud, sludge, etc., or a mixture thereof generated when sucking or dredging sediment deposited at the bottom of a large-capacity reservoir such as a dam. In the present invention, the term “large capacity reservoir” includes various dams (for example, lakes, recreational ponds, etc.) in which a decrease in effective depth due to sediment accumulation from the upstream side of the river is a problem. Regardless of whether it is an artifact or a natural object.

  As an important current issue for existing dams used for hydropower generation and irrigation, a large amount of sediment flowing from the upstream side accumulates on the bottom of the dam for many years, reducing its effective depth. As a result, the power generation capacity of the dam is reduced or the amount of stored water is reduced.

Therefore, in order to deal with such problems, for example, it has already been attempted to remove the sediment from the bottom of the dam and carry it out of the dam. A technique for sucking and transporting to a collection place around the dam has already been proposed (see Patent Document 1 below).
JP 11-46515 A

  However, it takes a lot of labor and energy (and hence cost) to carry a large amount of dredged sand out of the vicinity of a dam provided in the mountains where road conditions are not so good. The problem becomes conspicuous when dumping the sediment of the dam to the sea where it should flow (if there is no dam), and also causes traffic congestion.

  In order to transport the dam sediment to the sea while avoiding such problems, for example, it may be possible to release the dredged sediment directly to the river immediately downstream of the dam. It may cause water pollution and affect the river ecosystem.

  Therefore, a pipeline is connected between the dam and the sea or the nearby river, and a large amount of sediment deposited on the bottom of the dam is used to the sea or the nearby river using gravity (thus with less energy and cost). Although it is conceivable to transport by pipeline, if it is possible to recover even a part of the energy of the fluid flowing in the pipeline at the time of transport, it will be more advantageous in improving the energy efficiency of the entire system, especially the recovery. If the energy can be used as power for various auxiliary electric devices used in the transportation system, the energy saving effect is increased. In addition, in such a gravity transport system using a pipeline, it is necessary to flow a large amount of water from the dam along with the sediment to the sea or near it in order to smoothly flow a large amount of sediment in the pipeline. After transporting earth and sand to or near the sea, it is not preferable in terms of saving water resources to discard this large amount of water as it is in the sea or river.

  The present invention has been proposed in view of the above, and a large amount of sediment deposited on the bottom of a large-capacity reservoir such as a dam with less energy and cost, while considering that the natural environment is not affected as much as possible, Efficiently enables pipeline transportation to the sea or nearby rivers, and further saves energy by making it possible to recover part of the energy of the fluid during the pipeline transportation. In addition, the water in the fluid flowing down the pipeline It is an object of the present invention to provide a new dredged sand transport system that can return a part to a large-capacity reservoir or another reservoir without wasting energy.

  In order to achieve the above object, the invention of claim 1 is a transport for transporting dredged sand of a large-capacity reservoir in a high place away from the sea into which river water flows from the reservoir to the sea or a nearby river. A siphon pipe that sucks dredged sand from a large-capacity reservoir together with water by a siphon action, and a fluid containing dredged sand and water sucked out by the pipe. A dredged soil transport system including at least a natural flow path that naturally flows down to the sea or a river near the sea, wherein the natural flow path includes a plurality of pipelines arranged in tandem with each other. A relay rod that is interposed between the adjacent pipelines and can temporarily store the fluid flowing down from the upstream pipeline and release it to the downstream pipeline; It is connected to the downstream end of the line and can separate water from the fluid flowing down the pipeline and release it to the sea or nearby rivers, and temporarily store the remaining dredged sand. A water / sediment separation processing means capable of recovering at least a part, and a power conversion means capable of converting the flow energy of the fluid flowing therethrough into electric energy is provided in the transport path. It is characterized by.

  According to a second aspect of the present invention, in addition to the above configuration of the first aspect, the power conversion means is connected to an electric device that is driven using at least the electric energy converted by the power conversion unit and used in the transportation system. It is characterized by that.

  In addition to the above-described configuration of the first or second aspect, the invention of claim 3 is a reflux which connects between the water / sediment separation means and the large-capacity reservoir or a predetermined return water reservoir. A path is provided independently of the natural flow path, and the return path is configured to pump the water separated from the fluid by the water / sediment separation means to the large capacity reservoir or the return water reservoir. At least one pumping pump that is driven by the electric energy converted by the conversion means is provided, and the invention of claim 4 is characterized in that, in addition to the configuration of claim 3, the return path is A plurality of return pipes arranged in tandem and connecting between the water / sediment separation treatment means and the large-capacity reservoir or the return water reservoir, and adjacent return pipes, Return A plurality of return relay tanks that can temporarily store the return water that has flowed upward from the pipe, and the plurality of return pipes cause the return water to flow upward from the upstream end to the downstream end of each return pipe. Therefore, the pumping pump is provided for each return pipe.

  According to a fifth aspect of the present invention, in addition to the structure of any one of the first to fourth aspects, at least one of the siphon tube and the natural flow path is opened and closed so that the flow path can be opened and closed. A valve is provided.

  According to a sixth aspect of the present invention, in addition to the structure of any of the first to fifth aspects, the water / sediment separation processing means receives the fluid flowing down through the most downstream pipeline and supplies the fluid. A plurality of sedimentation tanks for precipitating dredged sand in the body are arranged so that the supernatant water in the fluid in each sedimentation tank can be sequentially overflowed to the downstream sedimentation tank, and the most downstream sedimentation It is characterized in that the supernatant water overflowing from the tank is discharged into the sea or a river near it.

  In addition to the structure of any one of claims 1 to 6, the invention of claim 7 is characterized in that each relay rod has an inlet portion to which an upstream pipeline is connected and an outlet to which a downstream pipeline is connected. And an opening / closing valve is provided at each of the inlet and outlet portions.

  Further, the invention of claim 8 is the construction according to any one of claims 1 to 7, wherein the pipeline bypasses at least one relay rod and is upstream from the inlet and downstream from the outlet. It is characterized by comprising a bypass path connecting to the pipeline, and the bypass path is provided with an on-off valve that can be shut off at any time.

  Furthermore, in addition to the structure of any one of claims 1 to 8, the invention of claim 9 is for supplying countless fine bubbles in the siphon tube, in at least one relay rod, or in at least a part of the pipeline. The microbubble supply means is provided.

  As described above, according to the present invention, dredged sand of a large-capacity reservoir located at a high place away from the sea is sucked out together with water by the siphon action of the siphon tube, and then is passed through the natural flow passage or near the sea. Since it was allowed to flow down naturally to the river, dredged sand in the large-capacity reservoir can be transported to the sea or nearby rivers without any difficulty using gravity, saving energy and reducing costs for the transport. In addition, there is no fear of polluting the river water area on the way with dredged soil or affecting the ecosystem, and there is no possibility of causing problems such as traffic congestion as in the case of transportation by dump truck. The natural flow path is interposed between a plurality of pipelines arranged in tandem with each other and adjacent pipelines, and temporarily stores the fluid flowing down from the upstream pipeline. Since it has a relay rod that can be discharged downstream, the internal pressure of each pipeline can be reduced and its durability can be increased, and maintenance on the pipeline can also be performed in units of pipelines separated by relay rods. Therefore, the maintenance work becomes relatively easy. In addition, water / sediment separation processing means arranged in line with the downstream end of the most downstream pipeline releases only relatively clean water from the fluid flowing down through the natural flow path to the sea or a river near it. When all the dredged sand is released directly into the sea or nearby river because it is possible to temporarily store the remaining dredged sand in the water / sediment separation processing means and collect at least part of it. Compared with, the water pollution of the sea or the river near it and the influence on the ecosystem can be suppressed as much as possible. In addition, since the transportation path is provided with power conversion means that can convert the flow energy of the fluid flowing through it into electrical energy, the dredged sand of the large-capacity reservoir can be transferred to the sea or a river near it by using gravity. In the process of flowing down naturally, the flow energy can be converted into electric energy and used efficiently.

  In particular, according to the invention of claim 2, the electric energy converted by the power conversion means is used in an electric device (for example, an electric pump or siphon for supplying priming water for starting siphon action in a siphon pipe) An electric pump that assists the siphoning of the pipe, an electric microbubble supply means for supplying countless fine bubbles inside the pipeline, etc., and sucking and sending dredged sand from other large-capacity reservoirs to nearby relay dredgers Can be effectively used as power of an electric pump or the like that can reduce the energy of the entire system. In addition, since the power conversion means and the electric device can be disposed relatively close to each other, the electric wiring between them can be simplified to reduce the cost.

  In particular, according to the invention of claim 3, between the water / sediment separation processing means and the large-capacity reservoir or the predetermined return water reservoir, a reflux path is provided independently from the natural flow path. The return path is driven by the electric energy converted by the power conversion means so as to pump the water separated from the fluid by the water / sediment separation means to the large capacity reservoir or the return water reservoir. Since at least one electric pump for pumping is provided, a part of the water separated from the fluid by the water / sediment separation means is not simply thrown into the sea or river, but a large capacity reservoir or return water reservoir. The energy can be forcibly returned while saving energy. Therefore, the return water can be effectively used for irrigation and the like, and can contribute to the saving of water resources.

  In particular, according to the invention of claim 4, the return channels are arranged in tandem with each other, a plurality of return pipes connecting the water / sediment separation processing means and the large capacity reservoir or the return water reservoir, and their phases A plurality of return relay tanks that are interposed between adjacent return pipes and can temporarily store the return water that has flowed upward from the downstream return pipes. In order to cause the return water to flow upward from the upstream end to the downstream end of the pipe, the pumping pump is provided for each return pipe, so that the water / sediment separation processing means and the large-capacity reservoir to which water is to be returned or Even if there is a large difference in height from the reservoir for return water, the return pump can be pumped with a relatively small capacity electric pump, and the cost of the electric pump can be reduced and its durability can be improved.

  In particular, according to the invention of claim 5, at least one of the siphon pipe and the natural flow path constituting the transport path is provided with at least one on-off valve that opens and closes the flow path so that the opening degree can be adjusted. By adjusting the opening of the on-off valve, it is possible to appropriately control the system while avoiding inconveniences such as water hammer phenomenon, flow speed overspeed, cavitation, etc., in starting, stopping and operating a series of transportation systems. Durability is improved.

  In particular, according to the invention of claim 6, the water / sediment separation processing means receives a fluid flowing down through the most downstream pipeline and a plurality of settling tanks for precipitating dredged sand in the fluid. Are arranged so that the supernatant water in the fluid in each of the settling tanks can overflow into the downstream settling tank sequentially, and the overflow water overflowing from the most downstream settling tank is Since it is discharged into the river, the purity of the discharged water can be increased, and the water pollution of the sea or the river near it and the influence on the ecosystem can be suppressed more effectively.

  In particular, according to the invention of claim 7, each relay rod includes an inlet portion to which an upstream pipeline is connected and an outlet portion to which a downstream pipeline is connected. Since each of the outlets is provided with an on-off valve, the above-mentioned pipeline maintenance work can be performed more efficiently and accurately by appropriately opening and closing the on-off valves, and the flow rate of the fluid flowing through each pipeline can be adjusted. It is also relatively easy to stop the flow during an emergency.

  Further, according to the invention of claim 8, the bypass path that bypasses at least one relay rod and connects the pipeline upstream from the inlet and the pipeline downstream from the outlet is provided. The bypass passage is provided with an open / close valve that can be shut off at any time, so if some of the relay rods become unusable due to being buried with earth and sand, etc. By closing the outlet and opening the corresponding open / close valve of the bypass passage, the fluid from the upstream can flow downstream by bypassing the unusable relay so that the operation of the system is not hindered. It can be carried out.

  In particular, according to the invention of claim 9, since it is equipped with electric microbubble supply means for supplying countless fine bubbles into the siphon tube, at least one relay rod, or at least a part of the pipeline, The effect of mixing and dispersing innumerable fine bubbles in the fluid can effectively reduce the frictional resistance between the fluid and the siphon tube or the inner surface of the pipeline, and can also reduce the density of the fluid. The fluid can flow smoothly. Also, since the aerobic microorganisms in the fluid can be sufficiently brought into contact with oxygen in the microbubbles and the microorganisms can be activated, the odor and turbidity of the fluid reaching the sea or near the estuary And the amount of dissolved oxygen increases, which is advantageous for environmental measures.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below based on examples of the present invention illustrated in the accompanying drawings.

  In the accompanying drawings, FIGS. 1 to 8 show a first embodiment of the present invention. FIG. 1 is an overall schematic longitudinal sectional view showing an outline of a dredged sand transport system, and FIG. 3 is an enlarged view taken along the arrow 3 in FIG. 1, FIG. 4 is an enlarged sectional view taken along line 4-4 in FIG. 3, and FIG. 5 is a longitudinal sectional view of the main part of the water / sediment separation processing means ( FIG. 6 is a plan view taken along the arrow 6 in FIG. 5. FIG. 7 is an enlarged vertical sectional view showing the main part of a second embodiment of the present invention.

  First, the first embodiment will be described. In FIG. 1, the dredged sediment transport system includes dredged sediment 1 generated by dredging work performed in a dam D as a large-capacity reservoir in a high place away from the sea O and into which water of the river R flows. It is used to transport from D to the sea O or the river R nearby by using gravity.

  This transport system includes a siphon pipe S that sucks dredged sand 1 of a dam D together with water by a siphon action, and a fluid that contains dredged sand 1 and water sucked in the pipe S, connected to the downstream end of the siphon pipe S. The natural flow path P that naturally flows down to the sea O or a nearby river R using gravity, and water from the fluid that has flowed through the natural flow path P to separate the water and the river near the sea O Water / sediment separation processing means SE that can be discharged into R and can temporarily store the remaining dredged sand 1 and collect at least a part thereof.

  In the illustrated example, the siphon pipe S is provided on a dredger work ship B that can be arbitrarily moved on the reservoir water surface of the dam D, and a movable suction pipe U in which the suction port Ue can be raised and lowered in water, and the movable suction pipe U The other end is connected to the downstream end, and the other end is provided on the downstream side of the dam D and at a position lower than the dam D. The movable suction pipe U and the transport pipe A cooperate with each other to form a siphon pipe S.

  Thus, the suction port Ue of the movable suction pipe U faces the sediment 1 or the vicinity of the bottom of the dam D, and the water supply pump Ry installed on the dredger ship B and connected to the siphon pipe S exhibits the priming function. The siphon action of the siphon tube S is started. As a result, the siphon pipe S can suck up the sediment 1 from the bottom of the dam together with the water from the suction port Ue, and can gradually and continuously flow through the pipe to the relay rod Pm0.

  Further, in the middle of the siphon tube S, the on-off valve V1 which can be interrupted at any time to temporarily interrupt the siphon operation, and air is mixed into the siphon tube S to cause the siphon operation of the tube S Air mixing means (not shown) for adjusting the suction force is provided. Further, the dredger work ship B is provided with drive means 2 capable of moving the suction port Ue of the movable suction pipe U up and down to an arbitrary height, and propulsion means for causing the work ship B to travel on its own (see FIG. (Not shown) is also provided.

  The relay dredging Pm0 is located immediately downstream of the dam D, and temporarily stores the fluid containing dredged sand 1 and water that has flowed down naturally from the siphon pipe S by the siphon action and can be gradually discharged downstream. The structure is basically the same as the relay rod Pm provided in the natural flow path P described later. That is, the tub unit case 3 formed in the shape of a water tank having a large capacity is placed on the ground, and the inside of the tub unit case 3 is divided into two chambers by the partition wall 3m, and one of the chambers becomes a relay tub Pm0. The other chamber serves as a return water relay tank Km, which will be described later.

  The downstream end of the siphon pipe S (the conveying pipe A in the illustrated example) is connected to the entrance portion 3i that opens to the relatively high position of the relay rod Pm0, and opens to a relatively low position of the relay rod Pm0. The outlet 3o is connected to the upstream end of the pipeline Pp located at the uppermost stream in the natural flow path P. Further, on the inlet 3i and the outlet 3o of the relay rod Pm0, on-off valves Vi and Ve are respectively provided so that each of them can be opened and closed individually.

  The natural flow path P is interposed between a plurality of pipelines Pp, which are arranged in tandem with each other, and the adjacent pipelines Pp, Pp, and the dredged sand that has flowed down from the upstream pipeline Pp. 1 and a relay rod Pm that temporarily stores a fluid containing water and can be gradually discharged to the downstream pipeline Pp. The relay rod Pm should ensure smooth natural flow of the fluid in each pipeline Pp based on the total length of the natural flow path P and the height difference between the upper and downstream ends of the natural flow path P. A plurality of them are installed at an appropriate distance and with an appropriate height difference, but needless to say, the downstream relay rod Pm is placed at a lower position. Each pipeline Pp is basically arranged in a downward slope or horizontally, but a part of the pipeline Pp may be an upward slope depending on the terrain on the way.

  One pipeline Pp connecting two adjacent relay rods Pm is configured by connecting a plurality of pipeline elements 4 arranged in series with each other in series, and at least a part of the pipeline Pp is connected. The pipeline element 4 is supported by a concrete support frame 5 that is erected and fixed on the ground at intervals in the length direction of the pipeline Pp.

  Each relay rod Pm has basically the same structure as the above-described relay rod Pm0 at the downstream end of the siphon tube S, and one of the two chambers partitioned by the partition wall 3m inside the rod unit case 3 is connected to the relay rod Pm0. Pm, and the other is a return water relay tank Km described later. The downstream end of the upstream pipeline Pp is connected to the inlet 3i of the relay rod Pm, and the upstream end of the downstream pipeline Pp is connected to the outlet 3e. The inlet portion 3i and the outlet portion 3e are provided with on-off valves Vi and Ve, respectively.

  A bypass path Pb that bypasses each relay rod Pm is connected to the pipeline Pp. That is, the bypass Pb is disposed so as to connect between the pipeline Pp upstream of the inlet 3i of each relay rod Pm and the pipeline Pp downstream of the outlet 3e. An on-off valve Vb that can shut off the bypass path Pb at any time is provided in the middle of the bypass path Pb. Therefore, if the relay dredger Pm becomes unusable due to being buried with earth or sand during transportation of dredged soil, the inlet 3i and outlet 3e of the relay dredger Pm are closed with the on-off valves Vi and Ve, By opening the on-off valve Vb of the corresponding bypass passage Pb, the fluid from the upstream can be flown downstream by bypassing the unusable relay rod Pm, so that the operation of the transportation system can be continued without any trouble. In the meantime, it is possible to perform the recovery work of the unusable relay rod Pm in parallel.

  At least some of the relay rods (upstream end relay rod Pm0 in the illustrated example) and at least some of the middle-stream pipelines Pp have a very small number of very small bubbles (air) having a diameter of 100 μm or less inside the pipeline Pp. ) Is provided. The microbubble supply means M sufficiently disperses and mixes fine bubbles in the pump 6 that sucks and pressurizes water from the relay rod Pm0 or the pipeline Pp, and the water pressurized by the pump 6. A multiphase flow generator 7 that generates a multiphase flow, and the multiphase flow generated by the multiphase flow generator 7 are joined to a pipeline Pp on the downstream side, and fine bubbles are mixed with the fluid flowing through the pipeline Pp. And a pipe 8. Incidentally, such a multi-phase flow generator for mixing a large amount of fine bubbles in water is conventionally known and has already been mass-produced industrially (for example, JP 2000-447 A, JP 7-265057 A). (See the official gazette).

  The fine bubbles are so-called “micro bubbles”, and not only the macro-sized bubbles are reduced, but also exhibit various physicochemical properties due to the size effect. For example, these fine bubbles rise very slowly as if the soot remains still in water, and the bubbles exhibit excellent uniformity and dispersibility in water. Furthermore, the gas absorption efficiency in water is high and oxygen is dissolved. There is a feature that the amount can be increased quickly. And, when such countless fine bubbles are mixed and dispersed in a fluid containing dredged sand and water in the pipeline Pp, the frictional resistance between the fluid and the inner surface of the pipeline Pp is effectively increased. This makes it possible to reduce the durability of the pipeline Pp, and furthermore, the density of the fluid can be reduced, so that the fluid can flow smoothly even with a relatively small height difference. Moreover, since the aerobic microorganisms in the fluid can be sufficiently brought into contact with oxygen in the fine bubbles and the microorganisms can be activated, the odor of the fluid when reaching near the sea O Since the turbidity is improved and the amount of dissolved oxygen is increased, the quality of water discharged into the sea O is improved, which is advantageous for environmental measures.

  The microbubble supply means M may be attached to the dredger work boat B or to another relay rod Pm, thereby flowing in the siphon pipe S or the pipeline Pp in the vicinity of the other relay rod Pm. The fine bubbles can be dispersed and mixed in the fluid containing the dredged soil 1 and water.

  The opening / closing valve V1 interposed in the siphon pipe S is configured so that the opening degree thereof can be arbitrarily finely adjusted. Appropriate control of the system is possible while avoiding inconveniences such as hammer phenomenon, flow speed overspeed, and cavitation, and the durability of each part of the system can be improved. A plurality of on-off valves V2 to Vn having the same structure and function as the on-off valve V1 are interposed at appropriate positions in the pipeline Pp, with only the on-off valve Vn at the most downstream end among them. Are shown in FIGS. 5 and 6, and other on-off valves are not shown.

  Next, the structure of the water / sediment separation means SE will be described with reference to FIGS. This water / sediment separation processing means SE is arranged continuously to the downstream end of the most downstream pipeline Pp of the natural flow path P, and in the illustrated example, is arranged at the riverbed 10 at the estuary Re.

  The water / sediment separation treatment means SE receives the dredged sand 1 flowing down via the natural flow path P and a fluid containing water and precipitates dredged sand 1 in the fluid. A3 is arranged so that the supernatant water in the fluid in each of the settling tanks A1 to A3 can be sequentially overflowed to the downstream settling tank, and the supernatant water overflowed from the most downstream settling tank A3 The ocean O is discharged directly.

  The plurality of settling tanks A1 to A3 are configured in a relatively shallow water tank shape with their upper surfaces opened, and are arranged in series in the river bed 10 near the estuary Re from the upstream side to the downstream side sequentially. Is done. The weirs 11 to 13 provided on the sea sides of the settling tanks A1 to A3 are formed so as to be lower on the downstream side. Sediment begins to settle.

  In the middle of the transport path L, for example, in the middle of the siphon pipe S, at the upstream part of at least a part of the relay rod Pm in the pipeline Pp, the upstream part of the water / sediment separation means SE in the pipeline Pp A hydroelectric generator G is provided as power conversion means capable of converting the flow energy of the flowing fluid into electric energy. In the illustrated example, each of the hydroelectric generators G is rotatably provided in the siphon tube S or the pipeline Pp, and the impeller Ga that converts the flow energy of the fluid flowing therethrough into rotational energy, and the siphon tube S. Or the generator Gb arrange | positioned on the outer side of the pipeline Pp, and the transmission mechanism Gc which transmits the rotational motion of the impeller Ga to the generator Gb are provided, and the rotational energy of the impeller Ga is generated by the generator Gb. Converted into electrical energy.

  The hydroelectric generator G is connected to the electric device so as to supply the electric energy generated by the hydroelectric device G to the nearest electric device. For example, the hydroelectric generator G provided in the siphon pipe S shown in FIG. 2 is an electric device in the dredger B (the priming water feed pump Ry for starting the siphon action on the siphon pipe S, the movable suction pipe U). Electric motor for raising / lowering the electric motor, an electric pump (not shown) for assisting the siphon action of the siphon tube S), and the electric power of the microbubble supply means M attached to the relay rod Pm0 directly below the dam D. The pump 6 and the like are connected to a pumping electric pump Kx and the like provided in the relay tank Km immediately below the dam D to drive these electric devices. Further, the hydroelectric generator G provided in the pipeline Pp shown in FIG. 3 includes an electric pump Kx for pumping provided in the nearby relay tank Km, and microbubble supply means attached to the nearby pipeline Pp. Connected to the M electric pump 6 and the like, these electric devices are driven.

  Further, a reflux path K that connects between the water / sediment separation means SE and the dam D is provided independently of the natural flow path P. In this reflux path K, in order to pump up the water separated from the fluid by the water / sediment separation processing means SE to the dam D, at least driven by the electric energy converted by the hydroelectric generator G as the power conversion means. One pumping pump Kx for pumping is provided.

  The recirculation path K is arranged in tandem so as to substantially follow the pipeline Pp, and a plurality of return pipes Kp connecting the water / sediment separation processing means SE and the dam D, and the return pipes Kp adjacent to each other. And a plurality of return relay tanks Km that can temporarily store the return water that has flowed upward from the downstream return pipes Kp. In order to cause the return water to flow upward from the upstream end to the downstream end of the return pipe Kp, the pumping electric pump Kx is provided for each return pipe Kp.

  Thus, the upstream end of the most upstream (and therefore the lowest) return pipe Kp opens into the most downstream settling tank A3 where the cleanest water can be separated in the water / sediment separation treatment means SE. The opening is provided with a pumping electric pump Kx for sucking water in the most downstream settling tank A3 and forcibly ascending and flowing in the return pipe Kp. Further, the upstream end of the intermediate return pipe Kp opens into the corresponding return relay tank Km, and the water in the relay tank Km is sucked into the opening to further pass through the upper return pipe Kp. An electric pump for pumping Kx that is forced to flow upward and moves toward the upper relay tank Km (or the dam D) is provided. The downstream end of the return pipe Kp which is the most downstream (and therefore at the highest position) opens into the dam D.

  As described above, each relay tank Km is provided in the common fence unit case 3 adjacent to each relay fence Pm0, Pm interposed in the transport path L with the partition wall 3m interposed therebetween. The relay facility can be reduced in size and simplified.

  Next, the operation of this embodiment will be described. When hitting the bottom of the dam D, the dredger B is assembled around the dam D and floated on the surface of the dam D. Next, the tip of the movable suction pipe U is lowered from the dredger work ship B, and the suction port Ue at the tip of the movable suction pipe U faces the sediment layer on the bottom of the water. In this state, the siphon action of the siphon pipe S is started by a priming action by a water pump (not shown) connected to the siphon pipe S.

  Once the siphoning action is started, the siphoning action continues even if the water absorption pump is stopped. By the siphoning action, the sediment 1 on the bottom of the dam D is sucked up with the water, and the relay dredging just downstream of the dam D Discharge gradually and continuously into Pm0. As the dredging work progresses, the position of the dredging work boat B is moved little by little, and thus the sediment 1 on the bottom of the dam D is efficiently spread over substantially the entire bottom of the water bottom with less energy and cost. It becomes possible.

  The fluid containing dredged sand 1 and water that has flowed into the first relay dredger Pm0 through the siphon pipe S partially precipitates and accumulates in the dredged sand Pm0, and the remaining dredged sand 1 and The fluid containing water is discharged from the outlet portion 3e to the natural flow path P (uppermost pipeline Pp) of the present invention, and naturally flows down the natural flow path P gradually and continuously by gravity.

  While the fluid containing dredged soil 1 and water naturally flows down the natural flow path P, the fluid that has flowed down the upstream pipeline Pp and reached the next relay rod Pm A part of dredged sand 1 precipitates and accumulates in Pm0, and the remaining fluid containing dredged sand 1 and water is discharged into the pipeline Pp on the downstream side from the outlet 3e, and gravity flows in the pipeline Pp. It flows down naturally. In this case, it is possible to adjust the amount of fluid flowing into the relay rods Pm0 and Pm by adjusting the opening of the on-off valve Vi on the inlet side of each relay rod Pm0 and Pm, and the relay rods Pm0 and Pm. By adjusting the opening degree of the opening / closing valve Ve on the outlet side, the flow amount of the fluid to the downstream pipeline Pp can be adjusted. The flow rate of the fluid flowing in the transport path L can also be adjusted by adjusting the opening degree of the on-off valves V1 to Vn provided at various locations on the transport path L.

  Thus, the fluid containing dredged soil 1 and water gradually moves downstream by repeating the above process in each relay dredger Pm, and finally the water / sediment separating means SE in the riverbed 10 near the estuary Re. To reach. In this water / sediment separation means SE, the fluid is sequentially received by the plurality of settling tanks A1 to A3 arranged in series along the river flow direction on the river bed 10, and the dredged soil 1 in the fluid is received. The supernatant water in the fluid in each of the sedimentation tanks A1 to A3 overflows to the downstream sedimentation tank in sequence, and finally the supernatant water overflowed from the most downstream sedimentation tank A3 is discharged directly into the sea O. Is done. In this case, since the sediments with finer particle sizes are deposited and deposited in the sedimentation tanks A1 to A3, the sediments 1 stored in the sedimentation tanks A1 to A3 are externally deposited. It can be collected without difficulty, and can be effectively used for construction materials, agricultural materials, and other uses according to the particle size. By collecting and collecting a part or all of the dredged soil 1 in the settling tanks A1 to A3 in this way, only relatively clean water with little or no dredged soil 1 can be discharged into the sea O. It is effective in preventing water pollution.

  By the way, it is possible to collect the dredged sand 1 in the middle of at least some of the relay dredgers Pm0, Pm... Upstream from the water / sediment separating means SE.

  That is, the sediment 1 deposited and accumulated in each of the relay rods Pm0, Pm can be easily collected and collected from each of the relay rods Pm0, Pm with the upper surface open, and it can be collected for construction materials and agriculture. Since it can be reused for materials and other purposes, the pipeline Pp downstream of each relay dredging Pm0, Pm is released with a relatively clean fluid containing dredged sand and water with a reduced content of dredged sand 1. Therefore, in combination with the separation and recovery effect of dredged soil 1 by the water / sediment separation means SE at the most downstream, the water discharged to the sea O can be sufficiently purified, More effective in preventing pollution. If at least a part of the dredged sediment 1 deposited and deposited in at least one relay rod Pm0, Pm is collected so as not to flow into the downstream pipeline Pp, the vicinity of the relay rod Pm0, Pm This is convenient when the dredged soil 1 is reused as construction material, agricultural material, etc., and the flow of dredged soil 1 to the sea side can be reduced by the amount of reuse.

  In this embodiment, a hydroelectric generator G is provided in the transport path L as power conversion means for converting the flow energy of the fluid flowing therethrough into electric energy, and the dredged sand of the dam D using gravity. In the process of naturally flowing down to the sea O or the river R near it, the flow energy is converted into electric energy, and this is efficiently used as power for various electric devices as described above used in the transportation system. In addition, since the hydroelectric generator G and the electric device in the transportation system can be arranged relatively close to each other, the electric wiring between them can be simplified to reduce costs.

  Further, in particular, between the water / sediment separation processing means SE and the dam D, a reflux path K connecting between them is provided independently from the natural flow path P. The reflux path K includes a water / sediment separation processing means. Since an electric pump Kx for pumping water separated from the fluid at SE back to the dam D is provided, a part of the water separated from the fluid by the water / sediment separation treatment means SE is simply passed to the sea or Rather than throwing it away into the river, it can be forcibly returned to the dam D while saving energy.

  Moreover, the reflux path K is disposed between the plurality of return pipes Kp that are arranged in tandem and connect the water / sediment separation means SE and the dam D, and the return pipes Kp adjacent to each other. And a plurality of return relay tanks Km capable of temporarily storing the return water flowing upward from the return pipe Kp on the side, and the electric pump Kx for pumping is provided for each return pipe Kp. Therefore, even if there is a large difference in height or distance between the water / sediment separation processing means SE and the dam D from which water is to be returned, a single electric pump Kx for pumping water / sediment separation processing means SE to the dam D It is not necessary to pump water at once, that is, with individual electric pumps Kx, from the water / sediment separation means SE to the upper relay tank Km, from the relay tank Km to the upper relay tank Km, or It is only necessary to pump water in a relatively short section from the relay tank Km directly below the dam D to the dam D with a small difference in height. As a result, even if the electric pump Kx for pumping having a relatively small capacity is used, the return water can be pumped to the dam D without difficulty, thereby reducing the cost and improving the durability of the electric pump Kx.

  As described above, according to the present embodiment, the dredged sand 1 of the dam D located at a high place away from the sea O is sucked together with water by the siphon action of the siphon pipe S, and then to the sea O via the natural flow path P. Since it is allowed to flow down naturally, the dredged soil of dam D can be transported to the sea O without any difficulty using gravity, and energy saving and cost reduction for the transportation can be achieved. There is no worry of polluting the water area with dredged soil or affecting the ecosystem, and there is no risk of inconveniences such as traffic congestion, air pollution, and vibration noise as in the case of transportation by dump truck. Further, the natural flow path P is configured by connecting adjacent ones of a plurality of pipelines Pp arranged in tandem with a relay rod Pm, so that the pipeline Pp is compared with the case where there is no relay rod. Since the internal pressure can be sufficiently reduced and the durability thereof is increased, and maintenance of the pipeline Pp can be performed in units of the pipeline Pp divided by the relay rod Pm, the maintenance work becomes relatively easy.

  In addition, the water / sediment separation processing means SE connected to the downstream end of the natural flow path P is located upstream of the river bed 10 near the estuary Re in a state where the plurality of sedimentation tanks A1 to A3 constituting each of the natural flow path P are open. Since it is arranged in series in order from the downstream side to the downstream side, relatively large sedimentation tanks A1 to A3 can be arranged in many stages using the wide space of the riverbed 10 and the water purification function is increased accordingly. be able to. In addition, when the riverbed 10 at the estuary Re is submerged due to flooding, the sediment in the sedimentation tanks A1 to A3 is washed away into the sea O by the muddy flow of the river. Don't worry.

  In addition, a part of the water separated from the fluid by the water / sediment separation processing means SE is not just discarded to the sea or river, but is pumped up by the electric pump Kx for pumping and returned to the dam D through the return path K. In this case, as the power of the electric pump for pumping Kx, the fluid generated by converting the fluid energy of the fluid into electrical energy by the hydroelectric generator G is used without waste. Therefore, a part of the water used for the flow discharge of dredged sand from the dam D to the sea can be returned to the dam D while saving energy, and this return water can be used effectively for irrigation and water use. This will save water resources.

  FIG. 7 shows a main part of the second embodiment of the present invention. In this embodiment, a fluid containing water and dredged soil that has been sucked out by a siphon pipe S ′ from a dam D ′ as another large-capacity reservoir in the vicinity thereof is supplied into at least some of the relay dredging Pm. . For this purpose, a second inlet 3i ′ through which the dredged sand 1 ′ of the dam D ′ flows through the siphon pipe S ′ is connected to the relay dredger Pm in the dredger unit case 3 near the downstream of the dam D ′. In addition, an opening / closing valve Vi ′ is also provided at the second inlet 3i ′. The rest of the structure of the second embodiment is basically the same as that of the first embodiment, and the constituent elements corresponding to those in the first embodiment are given the same reference numerals and the description thereof is omitted.

  Thus, in the second embodiment, the same effect as that of the first embodiment can be achieved and the fluid containing dredged sand 1 and water from the other dam D 'is received in the relay rod Pm. Can do. And the dredged sands 1 and 1 'from both dams D and D' can be easily merged at the relay dredger Pm, and both can naturally flow down to the sea O side using the downstream pipeline Pp. . In the second embodiment, the structure of the siphon tube S ′ is shown in a simplified manner for simplification of illustration. However, the other dams D ′ in the second embodiment also have the same structure as that of the dam D. A large dredging work similar to the dredging in the dam D may be performed using the dredging work boat B used in the above. Further, in the second embodiment, when dredging the other dam D ′, the water and dredged soil 1 ′ forcibly sucked up by the suction pump Rx without using the siphon pipe S ′ are put into the relay dredger Pm. In this case, the electric energy converted by the hydroelectric generator G may be used as the power of the suction pump Rx.

  In this way, if at least a part of the relay dredging Pm is supplied with a fluid containing water and dredged sand from the other large-capacity reservoirs D ′ nearby, a plurality of large-capacity reservoirs D, The dredged sand from D ′ can be easily merged at the relay dredger Pm, and can be naturally flowed down to the sea side using the pipeline Pp on the downstream side.

  As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to the said Example, A various design change can be performed.

  For example, in the above-described embodiment, the water / sediment separation processing means SE has shown that the supernatant water overflowed from the most downstream settling tank A3 is directly discharged into the sea O. In the present invention, the supernatant water is used. You may make it discharge | release to the river R near the sea O, for example, the river mouth Re.

  In the above embodiment, the water / sediment separation means SE is provided in the riverbed 10 near the river mouth Re. However, in the present invention, it is not always necessary to provide it in the riverbed, and at least the sea O or the river R near it. Any place where it can be discharged directly into the sea.

  Moreover, in the said Example, although the microbubble supply means M has mixed the microbubble in the siphon pipe S or the pipeline Pp, in this invention, even if it mixes a microbubble in the relay poles Pm0 and Pm. Good.

  Further, in the above-described embodiment, the dam bottom sediment was sucked directly into the siphon tube S as dredged soil. However, in the present invention, the dam bottom sediment is relatively hard and the siphon tube S is sucked. If the sediment cannot be sucked out only by the action, the sedimented sediment is excavated by jetting water pressurized by an electric pump (not shown), and the excavated sediment is sucked into the siphon pipe S as dredged soil. Good. In this case, the electric energy converted by the hydroelectric generator G can be used as the power of the electric pump.

  In the embodiment, the on-off valves V1 to Vn, Vb, Vi, Ve are manually opened / closed. However, in the present invention, these on-off valves are opened / closed by remote operation. May be.

  In the above-described embodiment, the relay rods Pm0 and Pm in the transport path L and the relay tank Km in the return channel K are arranged adjacent to each other with the partition wall 3m interposed in the common rod unit case 3. The relay rods Pm0, Pm and the relay tank Km may be provided separately in separate and independent cases, or may be installed at locations separated from each other.

  Moreover, in the said Example, although the downstream end of the reflux path K opened to the dam D, and what returned return water in the dam D was shown, in this invention, the downstream end of the reflux path K is shown. It is possible to open another return water reservoir (for example, artificial pond, natural pond, lake, etc.) located between the dam D and the sea O and pump the return water there by using an electric pump for pumping Kx. Good. In this case, the water in the return water reservoir can be used for irrigation.

  Moreover, in the said Example, what made the electric energy converted by the hydroelectric power generation apparatus G as a power conversion means used as a motive power of the various electric equipment provided in the dredged soil transportation system of this invention was shown. However, in the present invention (Claim 1), the electric energy may be taken out to the outside, and may be used as a power source for various electric devices outside the dredged sand transport system.

  In the above embodiment, the worker directly monitors the state of the stored water surface in the water / sediment separation means SE and the relay tank Km, and controls the operation of the pumping electric pump Kx according to the state. However, in the present invention, a water level sensor is installed in the water / sediment separation processing means SE or the relay tank Km, and the pumping pump Kx is operated in accordance with the detection signal (that is, the water level change) of the water level sensor. The control may be remotely controlled or automatically controlled. Further, in addition to the water level sensor, various sensors for monitoring the flow state (flow velocity, flow rate, etc.) are provided at various points in the transport path L and the return path K in the dredged sand transport system, and at least a part of the system Monitor means for monitoring the operating state of the valves and at least some of the electric devices are provided, and the operation of at least some of the valves and at least some of the electric devices is performed based on detection signals from the sensors and the monitoring means. Etc. may be used for centralized and automatic control.

Whole schematic longitudinal cross-sectional view which shows the outline | summary of the dredged sand transport system which shows 1st Example of this invention Enlarged view of the part indicated by arrow 2 in FIG. Fig. 3 is an enlarged view of the portion indicated by the arrow 3 in Fig. 1. 4-4 enlarged sectional view of FIG. Main part longitudinal cross-sectional view of water / sediment separation processing means (enlarged view of the part indicated by arrow 5 in FIG. 1) Plan view from arrow 6 in FIG. Main part enlarged longitudinal sectional view showing a second embodiment of the present invention

Explanation of symbols

A1 ~ A3 ・ ・ Settling tank D ・ ・ ・ Dam (large capacity reservoir)
K ··· Recirculation channel Km · Relay tank Kp · · · Return piping Kx · ·
M ··· Microbubble supply means (electric equipment)
O ... Sea P ... Natural flow path Pb ... Bypass path Pp ... Pipeline Pm ... Relay R ... River Re ... River mouth Rx ... Suction pump (Electric equipment)
Ry ... priming water supply pump (electric equipment)
S ··· Siphon tube SE ··· Water / sediment separation means Vb, Vi, Ve, V1 to Vn ··· Open / close valve 1 ··· Dredged sand 3i ··· Inlet portion 3e ··· Outlet portion

Claims (9)

The dredged sand (1) of the large-capacity reservoir (D) that is located at a high location away from the sea (O) flows from the reservoir (D) to the sea (O) or a river nearby ( Equipped with a transport route (L) for transporting to R),
This transport channel (L) is a siphon tube (S) that sucks dredged sand (1) of the large-capacity reservoir (D) together with water by siphoning,
Gravity is applied to fluids containing dredged soil (1) and water sucked out from the siphon tube (S) to the ocean (O) or nearby river (R). A dredged soil transport system including at least a natural flow path (P) for natural flow,
The natural flow path (P) is interposed between a plurality of pipelines (Pp) arranged in tandem with each other and adjacent pipelines (Pp) from the upstream pipeline (Pp). A relay rod (Pm) capable of temporarily storing the flowing fluid and discharging it to the downstream pipeline (Pp), and a downstream end of the most downstream pipeline (Pp) are provided to connect the pipeline. Water can be separated from the fluid flowing down (Pp) and released into the sea (O) or the river (R) nearby, and the remaining dredged sand (1) can be temporarily stored and at least And water / sediment separation means (SE) that can be partially recovered,
The transport system for dredged sand, characterized in that the transport path (L) is provided with power conversion means (G) capable of converting the flow energy of the fluid flowing therethrough into electrical energy.   The power conversion means (G) is connected to an electric device (Ry, M, Rx) that is driven using at least the electric energy converted by the power conversion means (G) and used in the transportation system. Item 2. The dredged material transport system according to item 1. Between the water / sediment separation processing means (SE) and the large-capacity reservoir (D) or a predetermined reservoir for return water, a return path (K) connecting between them is independent of the natural flow path (P). Provided,
In this reflux path (K), the power conversion means (G) is used to pump the water separated from the fluid by the water / sediment separation means (SE) to the large capacity reservoir (D) or the return water reservoir. 3. The dredged sand transport system according to claim 1, wherein at least one electric pump for pumping (Kx) driven by the electric energy converted in (1) is provided. The return path (K) is arranged in tandem with each other and a plurality of return pipes (Kp) connecting the water / sediment separation means (SE) and the large-capacity reservoir (D) or the return water reservoir. A plurality of return relay tanks (Km) interposed between the adjacent return pipes (Kp) and capable of temporarily storing the return water flowing upward from the downstream return pipe (Kp). Prepared,
In each of the plurality of return pipes (Kp), in order to cause the return water to flow upward from the upstream end to the downstream end of each return pipe (Kp), the pumping pump (Kx) for each return pipe (Kp) is provided. The system for transporting dredged soil according to claim 3, wherein:   At least one of the siphon pipe (S) and the natural flow path (P) is provided with at least one on-off valve (V1 to Vn) for opening and closing the flow path so that the opening degree can be adjusted. Item 5. The dredged sand transport system according to any one of Items 1 to 4. The water / sediment separation treatment means (SE) receives a fluid flowing down through the most downstream pipeline (Pp) and precipitates dredged sand (1) in the fluid. A1 to A3) are arranged so that the supernatant water in the fluid in each of the settling tanks (A1 to A3) can be sequentially overflowed to the downstream settling tank,
The dredge according to any one of claims 1 to 5, wherein the supernatant water overflowed from the most downstream settling tank (A3) is discharged into the sea (O) or a river (R) nearby. Sediment transport system.   Each relay rod (Pm) includes an inlet portion (3i) to which an upstream pipeline (Pp) is connected and an outlet portion (3e) to which a downstream pipeline (Pp) is connected. The system for transporting dredged sand according to any one of claims 1 to 6, wherein the inlet part (3i) and the outlet part (3e) are provided with on-off valves (Vi, Ve), respectively.   By bypassing at least one relay rod (Pm), between the pipeline (Pp) upstream of the inlet (3i) and the pipeline (Pp) downstream of the outlet (3e) The bypass path (Pb) to be connected is provided, and the bypass path (Pb) is provided with an on-off valve (Vb) capable of blocking the bypass path at any time. Dredged soil transport system.   Microbubble supply means (M) for supplying countless fine bubbles into the siphon pipe (S), at least one relay rod (Pm), or at least a part of the pipeline (Pp). The transport system for dredged soil according to any one of claims 1 to 8.

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